The model components identified as “modules" may to some extent be chosen in the analysis. A module may contain more than one distinct data type, or none. Modules with no data incorporate prior information, and this information may need to be cut, or modulated
in the same way as any other source of information entering the analysis.
[1]} and [2]} give Cut-model analyses, and [3]} and [4]} give \(\eta \) -SMI analyses of a hierarchical model for archaeological data in which one of the modules has a large vector of missing data, but no observed data.
